package simplelru
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// LRUCache is the interface for simple LRU cache.
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type LRUCache interface {
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// Adds a value to the cache, returns true if an eviction occurred and
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// updates the "recently used"-ness of the key.
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Add(key, value interface{}) bool
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// Returns key's value from the cache and
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// updates the "recently used"-ness of the key. #value, isFound
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Get(key interface{}) (value interface{}, ok bool)
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// Check if a key exsists in cache without updating the recent-ness.
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Contains(key interface{}) (ok bool)
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// Returns key's value without updating the "recently used"-ness of the key.
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Peek(key interface{}) (value interface{}, ok bool)
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// Removes a key from the cache.
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Remove(key interface{}) bool
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// Removes the oldest entry from cache.
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RemoveOldest() (interface{}, interface{}, bool)
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// Returns the oldest entry from the cache. #key, value, isFound
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GetOldest() (interface{}, interface{}, bool)
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// Returns a slice of the keys in the cache, from oldest to newest.
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Keys() []interface{}
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// Returns the number of items in the cache.
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Len() int
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// Clear all cache entries
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Purge()
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}
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